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Table 2 EATHE factors considered at different levels in Taguchi method

From: Optimization of operating parameters of earth air tunnel heat exchanger for space cooling: Taguchi method approach

Factor

Parameter

Level

L1

L2

L3

L4

A

Diameter of pipe (m)

0.10

0.15

0.20

0.25

B

Length of pipe (m)

30

40

50

60

C

Inlet air velocity (m/s)

2

3

4

5

D

Inlet air temperature (K)

307.35

311.35

315.35

319.35